Composition of matter to be used in making copying-pads.



EDUIN O. G. WINGKLER, OF NEW YORK, N. Y.

COMPOSITION OF I /IA'ITER TO BE USED IN MAKING- COPYING-PADS.

Specification of Letters Patent.

Patented Nov. 24, 1908.

Application filed February 24:, 1908. Serial No. 417,577.

Water substantially pure 37 5 parts Gelatin 100 Glycerin 375 Heavy spar50 lVillow charcoal powdered 2 A solution of 50 parts of muriatic acid.50 water.

A small quantity of animal or vegetable color.

To make this composition I first dissolve the gelatin in the water bymeans of a hot water bath, after the gelatin is dissolved entirely I addthe glycerin continuing heat ing and stirring constantly, then I add theheavy spar and the willow charcoal. To avoid the dirty gray coloration,which the charcoal will give to the composition I mix a small quantityof any suitable vegetable or animal color (yellow) to the charcoalbefore adding it to the composition.

After the composition is mixed thoroughly I pour it while hot in ashallow pan of any material not subject to oxidation letting it cooldown for an hour or two according to the temperature. Meanwhile Iprepare a solution of 50 parts of Water (substantially pure) and 50parts of muriatic acid and apply three coats of this solution to thesurface of the composition, letting each coating dry before applying thenext one. After 5-6 hours rest the composition is ready for use.

The use is the same as of the hectographs in use now, first I wet thesurface with a damped sponge and allow it to stand a couple minutes, Ithen transfer the original, written with a hectographic ink made ofanimal or vegetable colors, and let it remain on the surface for notmore than 2 minutes and remove it. Sixty to 80 copies can be taken.After use no washing is required, a rest of 12 hours will destroy thecolor of the writing rendering the pad ready for use again, previouswritings in no way interfering with the efliciency of the composition.

The purpose of adding heavy spar to the composition is: 1. To preparethe com position for the effect of the muriatic acid solution. 2: Toprevent the composition from hardening after the water is evaporated.

The purpose of adding willow charcoal is: 1: To aid the dissolution ofthe heavy spar. 2: To prevent the evaporation of the muriatic acid.

The composition requires no washing 0E because the solution of muriaticacid applied to by means of the coating process as described willdestroy the capacity of the ink to dye.

I am aware that a composition consisting of water, gelatin, glycerin andheavy spar has been used for the purpose of making copying pads, a padmade of a composition consisting of these ingredients only requires awashing off of the writing, which damages the composition, making itssurface uneven. I am also aware that muriatic acid added to water isused to make this washing off easier and less dainageable, but I am notaware that all the ingredients of my composition and the coating of ithas been used together.

I claim:

1. The herein described composition of matter consisting of: Water,gelatin, glycerin, heavy spar, Willow charcoal, a solution of water andmuriatic acid substantially as described and for the purpose specified.

2. The herein described composition of matter for making copying pads(hectographs) consisting of:

\Vater substantially pure 375 parts Gelatin 100 Glycerin 375 Heavy spar50 Willow charcoal powdered 2 A solution of 50 parts of muriatic acid 50water

